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求20.5*0.12的最简便算法

20-12.5*0.12 =20-1.5 =18.5 没有简算,直接计算

20-12.5×0.12 =20-12.5x4x0.03 =20-50x0.03 =20-1.5 =18.5

red

12.5×3.2 =25×0.5×0.4×8 =25×8×0.5×0.4 =200×0.2 =40

求“0.8 x 0.25 x 0.4 x 12.5 =”的简便运算 运算思路:先按照相乘化整数的方法,0.8乘以12.5等于10,0.4乘以0.25等于0.1,再计算10乘以0.1等于1。 0.8 X 0.25 X 0.4 X 12.5 = ( 0.8 X 12.5 ) X ( 0.25 X 0.4) = 10 X 0.1 = 1

3.2*12.5*0.25 =4*0.8*12.5*0.25 =(4*0.25)*(0.8*12.5) =1*10 =10

原式 =0.5x0.3x0.12+0.5x1 =0.5x0.036+0.5x1 =0.5x(0.036+1) =0.5x1.036 =0.518

0.8×0.25×0.4×12.5=0.25×0.4×0.8×12.5=0.1×10=1

简便算法 3.2×0.5×12.5 =(4×0.5)×(0.8×12.5) =2×10 =20

20-12.5×0.12 =20-12.5x4x0.03 =20-50x0.03 =20-1.5 =18.5 如果对您有帮助,望采纳!谢谢!

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